Design ideas:
1. For audio input, use two input sources: the first uses a standard PC audio connector for sensory testing, and because the PC is a two-channel output, add a channel switch on the PCB, the second Use pin/socket and reserve test hole for performance parameter test;
2. Due to the large size of the speaker, it is economically considered, so the pin/socket connection is used for the audio output;
3. For the SDSD-M test, since the XPP1150's electrical characteristics test includes SD high and low level tests, the pin is added and the VD is combined to complete the SD mode test.
4 The evaluation board meets the test of MSOP and TSSOP chip packages, that is, using dual packages on the PCB.
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